Operation With An "Other" Companion Receiver - AOR SDU5500 Manual

Use the spin wheel dial to so that the required ICOM radio is highlighted then press
"IC-R8500 Connected" (or whichever radio is specified) will briefly be displayed then the CF readout will
display the current receive frequency of the radio. Should any fault occur in connection with the
companion radio at this stage, the SDU5500 CPU will identify the receiver as "Other" being connected.
In this case check the radio parameters (baud rate setting etc) and leads then try again.
Warm Start
Once the SDU5500 has been configured following a cold start, it will not be necessary to enter the
companion radio details again as long as the SDU5500 remains connected to power (presuming that
you wish to continue using the same companion radio type)... even after the SDU5500 has been
switched off and back on again.
Cold start / Hot start
The initial display which appears on the screen after switching on depends on whether the SDU5500 has
remained connected to a power supply since last use. When the cold start is performed (if power has
been removed), the SDU5500 will start with menu page 1 while menu page 4 will appear when the
SDU5500 is hot-started. Either way, shuttling from page-to-page is possible.
General operational notes
The ICOM receiver will now be operated from the front panel of the SDU5500, receive frequency and
mode may be controlled. The receive frequency and receive mode may still be selected from the radio
controls. The minimum specified tuning step size is 100 Hz, any digits below 100 Hz will be ignored.
Note: If the ICOM receivers use a mode not supported by the SDU5500, the legend "NFM" will be
displayed.
Passive band scope
Should you prefer to operate the companion radio totally from it's own front panel, it is possible to
configure the SDU5500 for "Other" companion radio and use the display unit as a band scope only. The
Centre Frequency will then always be displayed as 10.7 MHz but an OFFSET will be displayed making
the measurement of interesting traces possible.

4-4 Operation with an "Other" companion receiver

The SDU5500 is designed to work with any companion radio which is equipped with a suitably wide
10.7MHz IF output of sufficient drive level. If you are using such a receiver which is not included in the
SDU5500 supported companion radio list, the following procedure should be observed. Make sure that
both the SDU5500 and companion radio are switched off.
•
Connect a suitable power supply using the d.c. lead provided. Ensure the correct polarity is observed,
the stripe signifies positive. (In certain market areas, a suitable power supply may be provided).
•
The RX CTR socket of the SDU5500 is not used as direct control of the companion radio's controls is
not possible.
•
Connect a 50 OHM patch lead between the RF IN BNC socket of the SDU5500 and the IF OUT socket
of the companion radio.
•
Switch on the companion radio. Now switch on the SDU5500.
The 'cold start' sequence does not apply as the SDU5500 will default to 'Other' receiver when a
supported radio type is not detected. The SDU5500 LCD will display various details. Under the item
"RX" (third line down from the top left of the LCD), "Other" radio will be displayed with the CF (centre
frequency) of 10.7 MHz.
It is a good starting point to ensure that menu "1" is displayed in the lower left corner of the LCD so that
you know where your are each time the SDU5500 is powered up, this is what happens by default.
Section 4-3-2, 4-4
. The legend
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